They found using words like 'we' and 'us' regularly to be a sign of "interdependence" and "general positivity" in romantic relationships.

University of California psychologist Megan Robbins said using these pronouns could change how you view your relationship.

"Hearing yourself or a partner say these words could shift individuals' ways of thinking to be more interdependent, which could lead to a healthier relationship," she said.

Is it the secret to a happy relationship?

Interdependence may not sound like an entirely positive attribute, but it's been linked to healthy behaviours like providing support and shared decision-making – which are really important in long-term relationships.

Researchers are looking at whether it's a chicken-egg scenario – does simply saying 'we' more make relationships happier? Or do people in happy relationships say 'we; more often?

"It could also be the case that because the relationship is healthy and interdependent, the partners are being supportive and use we-talk," Robbins added.